The all-in-one newsletter sponsorship platform

Subletter.io is the most comprehensive platform to sponsor newsletters, monetize your own newsletter with sponsored content, and much more.

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Advertise in newsletters

Grow your business by sponsoring over 3,000 of the most-read newsletters across more than 500 niches, and reach highly qualified readers.

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Monetize your newsletter

Join over 2,000 creators, media companies, and publishers who use Subletter to generate consistent, scalable revenue from their newsletters.

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Acquire newsletters

Grow your business through newsletter acquisitions — verify audience quality, find the ideal price, and make acquisitions in just a few clicks.

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Grow your email list with Optins

Opt-in Campaigns are designed to help you grow your mailing list with verified, high-intent subscribers. Your ad appears inside carefully selected newsletters, and readers can subscribe to your list instantly through our One-Click Opt-In feature — no form, no friction.

You only pay for the number of new subscribers who actively join your list, guaranteeing measurable and authentic results.

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Get more qualified visitors to your website

With Click Campaigns on Subletter, your ad is displayed inside newsletters read by engaged audiences in your industry.

You only pay for qualified and unique clicks — meaning real readers who are genuinely interested in your offer. Your ad is shown exclusively to the most relevant readers of each newsletter, ensuring that every click drives high-quality traffic to your website.

Advertise in 3,000 newsletters

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Create your ad content

Create your ad content with a simple editor — add a title, text, an image, and a button with a link to redirect readers to the webpage of your choice.

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Set a budget

Your budget will then be allocated to your campaign and will only be spent when you receive clicks or leads.

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Select newsletters

Select newsletters by filtering through languages and categories — your ad will only be displayed in those newsletters, targeting reader segments that best match your audience.

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Target with precision

Choose exactly who sees your ad — by audience category, country, or language. Your message will appear only in front of the readers that truly matter, across the newsletters you select to sponsor.

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New Advertiser Deal

Pay $500 and get $1,000 in ad credits to sponsor the newsletters of your choice

Claim the deal
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